Woodward MFR 12 User manual

37352A
Manual
Version 3.1xxx
Manual 37352A
MFR 12 Packages
Protection Relay

Manual 37352A MFR 12 Packages - Protection Relay
Page 2/62 © Woodward
WARNING
Read this entire manual and all other publications pertaining to the work to be performed before install-
ing, operating, or servicing this equipment. Practice all plant and safety instructions and precautions.
Failure to follow instructions can cause personal injury and/or property damage.
The engine, turbine, or other type of prime mover should be equipped with an overspeed (overtempera-
ture, or overpressure, where applicable) shutdown device(s), that operates totally independently of the
prime mover control device(s) to protect against runaway or damage to the engine, turbine, or other
type of prime mover with possible personal injury or loss of life should the mechanical-hydraulic gov-
ernor(s) or electric control(s), the actuator(s), fuel control(s), the driving mechanism(s), the linkage(s),
or the controlled device(s) fail.
Any unauthorized modifications to or use of this equipment outside its specified mechanical, electrical,
or other operating limits may cause personal injury and/or property damage, including damage to the
equipment. Any such unauthorized modifications: (i) constitute "misuse" and/or "negligence" within
the meaning of the product warranty thereby excluding warranty coverage for any resulting damage,
and (ii) invalidate product certifications or listings.
CAUTION
To prevent damage to a control system that uses an alternator or battery-charging device, make sure
the charging device is turned off before disconnecting the battery from the system.
Electronic controls contain static-sensitive parts. Observe the following precautions to prevent dam-
age to these parts.
•Discharge body static before handling the control (with power to the control turned off, contact a
grounded surface and maintain contact while handling the control).
•Avoid all plastic, vinyl, and Styrofoam (except antistatic versions) around printed circuit boards.
•Do not touch the components or conductors on a printed circuit board with your hands or with
conductive devices.
OUT-OF-DATE PUBLICATION
This publication may have been revised or updated since this copy was produced. To verify that you
have the latest revision, be sure to check the Woodward website:
http://www.woodward.com/pubs/current.pdf
The revision level is shown at the bottom of the front cover after the publication number. The latest
version of most publications is available at:
http://www.woodward.com/publications
If your publication is not there, please contact your customer service representative to get the latest
copy.
Important definitions
WARNING
Indicates a potentially hazardous situation that, if not avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation that, if not avoided, could result in damage to equipment.
NOTE
Provides other helpful information that does not fall under the warning or caution categories.
Woodward reserves the right to update any portion of this publication at any time. Information provided by Woodward is believed to be
correct and reliable. However, Woodward assumes no responsibility unless otherwise expressly undertaken.
© Woodward
All Rights Reserved.

Manual 37352A MFR 12 Packages - Protection Relay
© Woodward Page 3/62
Revision History
Rev. Date Editor Changes
NEW 06-03-02 TP Release based on 37141A
A 07-07-18 TP Minor corrections
Contents
CHAPTER 1. GENERAL INFORMATION.........................................................................................6
Introduction .............................................................................................................................................6
Measured Value Logging ........................................................................................................................7
Package Functional Descriptions ...........................................................................................................8
CHAPTER 2. ELECTROSTATIC DISCHARGE AWARENESS.............................................................9
CHAPTER 3. INSTALLATION .....................................................................................................10
Wiring Diagram .....................................................................................................................................10
Power Supply ........................................................................................................................................11
Measuring Inputs...................................................................................................................................12
Current ........................................................................................................................................12
Voltage........................................................................................................................................14
Discrete Inputs ......................................................................................................................................15
Outputs..................................................................................................................................................15
Relay Outputs (Standard / Packages 51V &IvIkR)....................................................................15
Interface ................................................................................................................................................16
DPC - Direct Configuration Interface ..........................................................................................16
CHAPTER 4. FUNCTIONAL DESCRIPTION ..................................................................................17
Functional Table....................................................................................................................................17
Control Inputs........................................................................................................................................18
Control Outputs .....................................................................................................................................19
Alarms ...................................................................................................................................................20
Alarm Messages .........................................................................................................................20
Alarm Acknowledgement ............................................................................................................20
CHAPTER 5. DISPLAY AND OPERATING ELEMENTS...................................................................21
Brief Description of LEDs and Push Buttons ........................................................................................21
LEDs......................................................................................................................................................22
Push Buttons.........................................................................................................................................23
LC Display.............................................................................................................................................24
Display in Automatic Mode (First Line of the Display: Measured Values)..................................24
Display in Automatic Mode (Second Line of the Display: Measured Values) ............................25
Display in Automatic Mode (Second Line of the Display: Alarm Indication)...............................25

Manual 37352A MFR 12 Packages - Protection Relay
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CHAPTER 6. CONFIGURATION ................................................................................................. 26
Basic Data ............................................................................................................................................ 27
Configuration Access............................................................................................................................ 27
Password.................................................................................................................................... 27
Change Passwords .................................................................................................................... 28
Direct Configuration.............................................................................................................................. 29
Measurement........................................................................................................................................ 30
Voltage Measurement (Package 51V) ....................................................................................... 30
Potential Transformer Configuration (Package 51V) ................................................................. 30
Current Transformer Configuration ............................................................................................ 30
Rated Values.............................................................................................................................. 31
Power Measurement .................................................................................................................. 31
Protection.............................................................................................................................................. 32
Independent Time-Overcurrent Monitoring (Packages CP / 51V) ............................................. 32
Inverse Time-Overcurrent Monitoring (Package 51V) ............................................................... 34
Inverse Time-Overcurrent Monitoring with Voltage Restraint (Package 51V) ........................... 37
Ground Fault Monitoring (Packages CP / 51V / 50-51GN)........................................................ 39
Non-Direct. Ground-Fault Monit. via Displacement Volt. (Package IvIkR) ................................ 41
Ground-Fault Monitoring, Measured (Package IvIkR) ............................................................... 43
Directional Ground Fault Monitoring (Package IvIkR)................................................................ 44
Relay Configuration .............................................................................................................................. 46
Auto Acknowledgement of the Relays ....................................................................................... 46
Auto Acknowledgement of Messages ........................................................................................ 47
Changing the Relay Assignment (Standard / Packages 51V &IvIkR)....................................... 48
CHAPTER 7. COMMISSIONING.................................................................................................. 50
APPENDIX A. DIMENSIONS ...................................................................................................... 51
APPENDIX B. TECHNICAL DATA .............................................................................................. 52
APPENDIX C. MEASURED QUANTITIES AND ACCURACY............................................................ 54
APPENDIX D. LIST OF PARAMETERS........................................................................................ 55
APPENDIX E. SERVICE OPTIONS ............................................................................................. 57
Product Service Options....................................................................................................................... 57
Returning Equipment for Repair........................................................................................................... 57
Packing a Control ....................................................................................................................... 58
Return Authorization Number RAN ............................................................................................ 58
Replacement Parts ............................................................................................................................... 58
How to Contact Woodward................................................................................................................... 59
Engineering Services............................................................................................................................ 60
Technical Assistance............................................................................................................................ 61

Manual 37352A MFR 12 Packages - Protection Relay
© Woodward Page 5/62
Illustrations and Tables
Illustrations
Figure 3-1: Wiring diagram .....................................................................................................................................................10
Figure 3-2: Power supply.........................................................................................................................................................11
Figure 3-3: Measuring inputs - current ....................................................................................................................................12
Figure 3-4: Measuring inputs - Connections............................................................................................................................13
Figure 3-5: Measuring inputs - Connection .............................................................................................................................13
Figure 3-6: Measuring inputs - Displacement voltage.............................................................................................................14
Figure 3-7: Measuring inputs - Reference voltage...................................................................................................................14
Figure 3-8: Discrete inputs.......................................................................................................................................................15
Figure 3-9: Relay outputs.........................................................................................................................................................15
Figure 5-1: Front panel ............................................................................................................................................................21
Figure 6-1: Diagram for independent time-overcurrent monitoring.........................................................................................32
Figure 6-2: Inverse time-overcurrent - characteristic "normal inverse"...................................................................................35
Figure 6-3: Inverse time-overcurrent - characteristic "very inverse".......................................................................................36
Figure 6-4: Inverse time-overcurrent - characteristic "extremely inverse" ..............................................................................36
Figure 6-5: Characteristic of the inverse time-overcurrent monitoring with voltage restraint (knee curve setting 20 %) .......37
Figure 7-1: Dimensions............................................................................................................................................................51
Tables
Table 3-1: Conversion chart - wire size...................................................................................................................................11
Table 4-1: Alarm messages......................................................................................................................................................20
Table 5-1: Alarm messages......................................................................................................................................................25
Table 6-1: Release delay of the relays.....................................................................................................................................47
Table 6-2: Protective function output to relay .........................................................................................................................49

Manual 37352A MFR 12 Packages - Protection Relay
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Chapter 1.
General Information
Introduction
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The MFR 12 model is a complete generator protection unit packaged into one compact device. Typical applica-
tions are generators and switchgear equipment that require independent protection architecture. Different pack-
ages offer additional functionality.
The detailed model description for the MFR 12 reads as follows:
MFR1215 B/ ABDEF..Z
Packages according to the package list. These packages can be found in the manual. Each chapter headline points
out if the described function is standard or part of a package.
Mounting
[B].. Flush-mounting
Current transformer, secondary
[0] = not available
[1] = ../1 A
[5] = ../5 A
Voltage transformer/PTs, secondary
[0] = no voltage measurement
[1] = 100 Vac
Type
Examples:
•MFR1205B/CP (flush mounted, standard unit with ../5 A CT inputs with the CP Package [independent time-
overcurrent, ground fault (calculated), 3 relay outputs])
•MFR1211B/51V (flush mounted, standard unit with 100 Vac PT and ../1 A CT inputs with the 51V Package
[inverse time-overcurrent, inverse time-overcurrent with voltage restraint, ground fault (calculated), 8 relay
outputs])

Manual 37352A MFR 12 Packages - Protection Relay
© Woodward Page 7/62
Measured Value Logging
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Voltage
Package 51V: Voltage dependent time-overcurrent.
Current
Packages CP /51V: Three-phase measurement of the r.m.s. value.
• ../1 A ................................[1]
• ../5 A ................................[5]
Ground Fault
The displayed ground current is digitally filtered from the measured currents. This prevents inaccurate values
caused by the oscillations of the sine wave associated with ground fault currents from being displayed.
Packages CP /51V: The ground fault current is a calculation of the three phase currents vectorial sum.
This measurement is suitable for line-to-ground monitoring in rigid or half-rigid earthen mains (e.g. In phase-
to-phase low voltage mains). The measured line-to-ground current should be at least 10% of the current trans-
former's rated current to ensure proper protection.
Package 50-51GN: The ground fault current is a direct measurement of the single-phase ground current.
This measurement is suitable for line-to-ground monitoring in rigid or half-rigid earthen mains (e.g. in phase-
to-phase low voltage mains). In addition single-phase current transformers in the mains star point, in Holm-
green connection or cable-type current transformers are used for the measuring current.
Package IvIkR: The ground fault current is a direct measurement of ground current via cable-type current
transformer.
This measurement is suitable for the line-to-ground protection in insulated or balanced mains in which very
few ground currents appear. In addition cable-type current transformers or balanced transformers in Holm-
green connection are used for the measuring current.
Displacement Voltage
Package IvIkR: The ground fault current is a direct measurement of the displacement voltage.
The measurement is carried out via the open delta winding (e-n-winding) of a voltage transformer or via a
zero-point transformer in the generator star point.

Manual 37352A MFR 12 Packages - Protection Relay
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Package Functional Descriptions
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Depending on the model, the unit is equipped with the following functions
Function Package
CP 51V IvIkR 50-51GN
General functions
1 ready for operation relay output (normally open contact) 9999
Additional freely configurable relay outputs (2 change-over contacts) 9999
Additional freely configurable relay outputs (4 change-over contacts, 1 make contacts) 99
Discrete input for blocking of protective functions or remote acknowledgment 9999
Protective functions
Independent time-overcurrent monitoring I>, I>>, I>>> 99
Inverse time-overcurrent monitoring (according to IEC255) #1 Ia>> 9
Inverse time-overcurrent monitoring with voltage restraint I> (V<) 9
Non-directional ground fault monitoring via displacement voltage VE>
9
Ground fault monitoring, calculated from IL1+IL2+IL3 IE>> 99
Directional ground fault monitoring #2 IE>, IE>>
9
Ground fault monitoring, measured via cable-type current transformer IE>, IE>>
9
Ground fault monitoring, measured via current transformer IE>, IE>>
9
#1 only when inverse time-overcurrent monitoring with voltage restraint is disabled
#2 only when ground fault monitoring via cable-type current transformer and non-directional ground fault monitoring are en-
abled
Intended Use The unit must only be operated in the manner described by this manual. The prerequisite for a
proper and safe operation of the product is correct transportation, storage, and installation as well as careful op-
eration and maintenance.
NOTE
This manual has been developed for all available packages. Inputs/outputs, functions, configuration
screens, and other details described, which do not exist on your unit, may be ignored.
The present manual has been prepared to enable the installation and commissioning of the unit. Due to
the large variety of parameter settings, it is not possible to cover every combination. The manual is
therefore only a guide. In case of incorrect entries or a total loss of functions, the default settings may
be taken from the list of parameters enclosed at the rear of this manual.

Manual 37352A MFR 12 Packages - Protection Relay
© Woodward Page 9/62
Chapter 2.
Electrostatic Discharge Awareness
All electronic equipment is static-sensitive, some components more than others. To protect these components
from static damage, you must take special precautions to minimize or eliminate electrostatic discharges.
Follow these precautions when working with or near the control.
1. Before doing maintenance on the electronic control, discharge the static electricity on your body to
ground by touching and holding a grounded metal object (pipes, cabinets, equipment, etc.).
2. Avoid the build-up of static electricity on your body by not wearing clothing made of synthetic materials.
Wear cotton or cotton-blend materials as much as possible because these do not store static electric char-
ges as easily as synthetics.
3. Keep plastic, vinyl, and Styrofoam materials (such as plastic or Styrofoam cups, cigarette packages, cello-
phane wrappers, vinyl books or folders, plastic bottles, etc.) away from the control, modules, and work
area as much as possible.
4. Opening the control cover may void the unit warranty.
Do not remove the printed circuit board (PCB) from the control cabinet unless absolutely necessary. If
you must remove the PCB from the control cabinet, follow these precautions:
•Ensure that the device is completely voltage-free (all connectors have to be disconnected).
•Do not touch any part of the PCB except the edges.
•Do not touch the electrical conductors, connectors, or components with conductive devices or with
bare hands.
•When replacing a PCB, keep the new PCB in the plastic antistatic protective bag it comes in until you
are ready to install it. Immediately after removing the old PCB from the control cabinet, place it in the
antistatic protective bag.
CAUTION
To prevent damage to electronic components caused by improper handling, read and observe the pre-
cautions in Woodward manual 82715, Guide for Handling and Protection of Electronic Controls, Printed
Circuit Boards, and Modules.

Manual 37352A MFR 12 Packages - Protection Relay
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Chapter 3.
Installation
Wiring Diagram
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
supervised system
Subject to technical modifications.
715 7 86 70 40 41 4342 44 45 1
Ground fault current via
cable-type current transformer
(35 mA)
Blocking of protective functions/
remote acknowledgement
0 Vdc
Measuring current L1
Measuring current L2
Measuring current L3
3/4
2 43
Relay 4
Relay 5
Relay 6
Relay 7
Relay 2
Relay 1
(Ready for operation)
2005-10-13 | MFR 12 Wiring Diagram r12ww-4105-ap.skf
121110913 161514
MFR 12 (Multi Function Relay)
L1
L2
L3
N
Displacement voltage
via e-n-winding or
zero-point transformer
(max. 100 Vac)
1 4
51V / IvIkR
IvIkR
24 Vdc
27212019 22 26252423 28 32313029
all 51V
CP / 51V
Relay 8
Relay 3
The socket for the PC configuration
is situated on the side of the unit.
This is where the DPC must be
plugged in.
Voltage dependent time
over-current protection
all
2
40 41
Ground fault current ../1 A
50-51GN
IvIkR
s2 (l)
s1 (k)
s2 (l)
s1 (k)
s1 (k)
s2 (l)
s2 (l)
s1 (k)
Figure 3-1: Wiring diagram

Manual 37352A MFR 12 Packages - Protection Relay
© Woodward Page 11/62
WARNING
All technical data and ratings indicated in this chapter are not definite! Only the values indicated under
Technical Data on page 52 are valid!
CAUTION
A circuit breaker must be located near to the unit and in a position easily accessible to the operator.
This must also bear a sign identifying it as an isolating switch for the unit.
NOTE
Inductive devices connected to the system (such as operating current coils, undervoltage tripping
units, or auxiliary/power contacts) must be connected to a suitable interference suppressor.
The following chart may be used to convert square millimeters [mm²] to AWG and vice versa:
AWG mm² AWG mm² AWG mm² AWG mm² AWG mm² AWG mm²
30 0.05 21 0.38 14 2.5 4 25 3/0 95 600MCM 300
28 0.08 20 0.5 12 4 2 35 4/0 120 750MCM 400
26 0.14 18 0.75 10 6 1 50 300MCM 150 1000MCM 500
24 0.25 17 1.0 8 10 1/0 55 350MCM 185
22 0.34 16 1.5 6 16 2/0 70 500MCM 240
Table 3-1: Conversion chart - wire size
Power Supply
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18 to 30 Vdc
7 8
0 V
18 to 30 Vdc
Power supply
Figure 3-2: Power supply
Terminal Description Amax
Standard
8 18 to 30 Vdc 2.5 mm²
7 0 V reference point 2.5 mm²

Manual 37352A MFR 12 Packages - Protection Relay
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Measuring Inputs
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Current
WARNING
Prior to disconnecting the current transformer connections or the connections of the transformer
which are located at the unit, ensure that the transformer is short-circuited.
NOTE
Grounding of the secondary of a current transformer must always be single-sided.
Overcurrent, Line-to-Ground Protection (Packages CP /51V)
Detail:
Connection of the transformers
Generator
current
../1 A or ../5 A
L3
L2
L1
N
G
S2 S1
s2 (l)
s1 (k)
s2
L..
.. ..
s1
L.. s1 (k)
s2 (l)
s1 (k)
s2 (l) L2
s1 (k)
s2 (l)
4243 40414445
L1
L3
G
Figure 3-3: Measuring inputs - current
Terminal Measurement Description Amax
40 Generator current L1, transformer terminal s1 (k) 4 mm²
41 Generator current L1, transformer terminal s2 (l) 4 mm²
42 Generator current L2, transformer terminal s1 (k) 4 mm²
43 Generator current L2, transformer terminal s2 (l) 4 mm²
44 Generator current L3, transformer terminal s1 (k) 4 mm²
45
Transformer
../1 A or
../5 A
Generator current L3, transformer terminal s2 (l) 4 mm²
NOTE
The current transformers installation location will determine the protection area of the ground fault
monitoring.

Manual 37352A MFR 12 Packages - Protection Relay
© Woodward Page 13/62
Ground Current for Low-Impedance or Solidly Grounded Systems (Package 50-51GN)
N
4041
L1
L2
L3
Earth current
I
e
G
3~
L2
L3
L1
G
3~
L2
L3
L1
L2
L3
L1
Holmgreen
connection
Cable-type current
transformer
G
3~
L2
L3
L1
R R
R
One-pole transformer in star point
R
Figure 3-4: Measuring inputs - Connections
Terminal Measurement Description Amax
40 Ie (Ground current) 4 mm²
41 via Holmgreen
Connection N 4 mm²
40 Ie (Ground current) 4 mm²
41 via cable-type
current transf. N 4 mm²
40 Ie (Ground current) 4 mm²
41 via one-pole
transformer N 4 mm²
NOTE
The current transformers installation location will determine the protection area of the ground fault
monitoring.
Ground Current for Isolated or Balanced Networks (Package IvIkR)
Cable-type current transformer
Earth current
L2
L3
L1
G
3~
70 71
I
e
GND
Figure 3-5: Measuring inputs - Connection
Terminal Measurement Description Amax
71 Ground current Ie 2.5 mm²
70 Transformer
35 mA GND 2.5 mm²

Manual 37352A MFR 12 Packages - Protection Relay
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Voltage
Neutral Voltage Displacement (Package IvIkR)
WARNING
Voltage dividers must be utilized on voltage potential transformers that have secondary outputs
greater than 100 Vac.
L2
L3
L1L1
G
3~
G
3~
L2
L3
N
V
e
R
b
R
b
Displacement
voltage
14
e-n-winding Zero point transformer
Rb= Loading resistor
Figure 3-6: Measuring inputs - Displacement voltage
Terminal Measurement Description Amax
Zero point transformer
1 Ve (displacement voltage) 2.5 mm²
4 via zero point
transformer N 2.5 mm²
Open e-n-winding
1 Ve (displacement voltage) 2.5 mm²
4 via
e-n-winding N 2.5 mm²
Reference Voltage (Package 51V)
NOTE
The reference voltage is used as overcurrent tripping depending on the monitored undervoltage and as
overcurrent tripping depending on the direction.
Measuring
voltage
L3
L2
L1
N
G
1234
L3
L2
L1
N
Figure 3-7: Measuring inputs - Reference voltage
Terminal Measurement Description Amax
1 Measuring voltage L1 2.5 mm²
2 Measuring voltage L2 2.5 mm²
3 Measuring voltage L3 2.5 mm²
4
400V direct
or via transd.
../100V Star point of three-phase current system/ meas. transf. 2.5 mm²

Manual 37352A MFR 12 Packages - Protection Relay
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Discrete Inputs
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
Signal device
Discrete input
AB
18 to 250 Vac/dc
Figure 3-8: Discrete inputs
Terminal Assigned
common Description (according to DIN 40 719 Part 3, 5.8.3) Amax
A B
5 6
Blocking of protective functions / remote acknowl-
edgement 2.5 mm²
Outputs
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
Relay Outputs (Standard / Packages 51V &IvIkR)
AB
Relay output
Relay output
external device
external device
external device
CDE
max. 250 V AC
Figure 3-9: Relay outputs
Terminal Description
Make-contact Amax
root closing
A B
9 10 Relay 1 2.5 mm²
31 32 Relay 8 Packages 51V &IvIkR 2.5 mm²
Change-over contact
closing root opening
C D E
11 12 13 Relay 2 2.5 mm²
14 15 16 Relay 3 2.5 mm²
19 20 21 Relay 4 Packages 51V &IvIkR 2.5 mm²
22 23 24 Relay 5 Packages 51V &IvIkR 2.5 mm²
25 26 27 Relay 6 Packages 51V &IvIkR 2.5 mm²
28 29 30 Relay 7 Packages 51V &IvIkR 2.5 mm²

Manual 37352A MFR 12 Packages - Protection Relay
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Interface
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
DPC - Direct Configuration Interface
NOTE
Configuration with the direct configuration cable DPC (P/N 5417-557) is possible. A laptop/PC, the DPC
cable, the program LeoPC1 version 3.1.1 or higher (included on CD Rom with unit), and the proper con-
figuration files are required. Please consult the online help installed when the program is installed for a
description of the LeoPC1 program and its setup.
WARNING
Only the DPC cable may be connected to the DPC interface. If other devices or lines are connected, the
unit may be destroyed. Especially the connection of live lines (like phone lines) will destroy the unit.
CAUTION
The connection cable delivered with the DPC must be used between DPC and the unit to ensure proper
functionality of the unit. An extension or utilization of different cable types for the connection between
the unit and DPC may result a malfunction of the unit. This may possibly result in damage to compo-
nents of the system. If an extension of the data connection line is required, only the serial cable (RS-
232) between DPC and laptop/PC may be extended. It is recommended to use an industry standard ca-
ble for this.
NOTE
If the parameter "Direct config." is enabled on the control, communication via the CAN bus interface on
terminals X1/X5 is disabled.
If the control unit detects that the engine is running (ignition speed exceeded), the direct configuration
port is disabled.

Manual 37352A MFR 12 Packages - Protection Relay
© Woodward Page 17/62
Chapter 4.
Functional Description
Functional Table
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Monitoring
Ve Monitoring Ie Line-to-ground
directional fault DI
Blocking Function Message
0 0 X X
0 1 X 0 Tripping Ie> Ground fault
current 1/2
0 1 X 1 Tripping Ie> blocked
1 0 X X Tripping Ve Line-to ground
fault Ve
1 1 0 0
Tripping Ie (falls Ve>*),
nondirectional Ground fault current 1/2
1 1 0 1 Tripping Ve>, Ie> blocked Line-to-ground
fault Ve
1 1 1 0 Tripping Ie> Line-to-ground
fault 1/2
1 1 1 1 Tripping Ve>, Ie> blocked Line-to-ground
fault Ve
*) By exceeding maybe relay output "Excitation line-to-ground fault Ve", no display message.
Application flow, if Ve and Ie were activated
Threshold Ve will be exceeded:
no display message if so relay message "Excitation line-to-ground fault Ve"
Threshold Ie will also be exceeded:
message "Line-to-ground fault", if setting Line-to-ground fault directional = ON with direction control

Manual 37352A MFR 12 Packages - Protection Relay
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Control Inputs
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
Blocking of protective
functions / Remote ac-
knowledgement
Terminal 5/6
Energizing this discrete input disables various protective functions. This
functionality may be desired if the control is used for generator protection.
This keeps the control from recognizing fault conditions (i.e. undervoltage,
underfrequency) when the generator is not operating. If blocking of these
protective functions is not required, the discrete input should not be con-
nected to any potential source.
The following protective function cannot be blocked via this discrete in-
put:
•Non-directional ground fault monitoring via displacement voltage
External acknowledgement
of the relays via the discrete
input "Blocking of protec-
tive functions / remote ac-
knowledgement"
External
Clearing ON
If the unit should not automatically reset the relays after the fault is no
longer present, the parameter "Auto clearing Relays" must first be
configured "OFF" (refer to "Auto Acknowledgement of the Relay" on
page 46).
OFF..............Alarms that cannot be blocked will not automatically reset af-
ter the fault condition is no longer present. Pressing the
"Clear" button resets the relays.
ON................All alarm messages are reset if terminals 5/6 ("Blocking of
protective functions / remote acknowledgement") are ener-
gized. Alarms that cannot be blocked are only reset after the
fault is no longer present.

Manual 37352A MFR 12 Packages - Protection Relay
© Woodward Page 19/62
Control Outputs
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NOTE
A description of the relay manager may be found in Changing the Relay Assignment (Standard / Pack-
ages 51V &IvIkR) starting on page 48.
Relay 1
Terminal 9/10 Output relay (type: make contact, N.O.)
The "relay manager" controls this relay.
NOTE
The "ready for operation" function is always assigned to relay 1. However, other protective functions
may also be assigned to relay 1 additionally. Relay 1 is always configured as Normally Closed (break
contact) and will de-energize if the unit is not ready for operation.
Relay 2, 3
Terminal 11 through 16 Output relay (type: change-over contact)
The "relay manager" controls these relays.
Packages 51V &IvIkR
Relay 4 to 7
Terminal 19 through 30
Output relay (type: change-over contact)
The "relay manager" controls these relays.
Packages 51V &IvIkR
Relay 8
Terminal 31/32
Output relay (type: make contact, N.O.)
The "relay manager" controls this relay.

Manual 37352A MFR 12 Packages - Protection Relay
Page 20/62 © Woodward
Alarms
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Alarm Messages
Table 4-1 contains a list of all alarm messages that the control may monitor for depending on how the unit is con-
figured:
Alarm type Alarm text
Independen time-overcurrent, level 1 Packages CP / 51V Ov.curr. 1
Independen time-overcurrent, level 2 Packages CP / 51V Ov.curr. 2
Independen time-overcurrent, level 3 Packages CP / 51V Ov.curr. 3
Inverse time-overcurrent with voltage restraint Package 51V I> (invers)
Inverse time-overcurrent Package 51V I> (invers)
Ground fault, level 1 Standard Earthcur.1
Ground fault, level 2 Standard Earthcur.2
Non-directional ground fault via displacement voltage Package IvIkR E.fault Ve
Table 4-1: Alarm messages
Alarm Acknowledgement
A fault/alarm is indicated by the "Alarm" LED.
By pressing the "Clear" button, the active faults are acknowledged. The following distinction is made between
fault conditions:
The fault ...
•is still active As long as the fault is still present, it cannot be acknowledged. The flashing "Alarm"
LED on the front panel indicates that the alarm is still active.
•is no longer active When the active fault has been eliminated, the flashing "Alarm" LED changes to steady
illumination. If the parameter "Auto clearing displays" is configured "ON", the LED ex-
tinguishes after the resetting time has expired. If the parameter "Auto clearing displays"
is configured "OFF", the LED is extinguished only after pressing the "Clear" button.